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haproxy/src/hlua_fcn.c

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/*
* Lua safe functions
*
* Copyright 2015-2016 Thierry Fournier <tfournier@arpalert.org>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
*
* All the functions in this file runs with a Lua stack, and can
* return with a longjmp. All of these function must be launched
* in an environment able to catch a longjmp, otherwise a
* critical error can be raised.
*/
#define _GNU_SOURCE
#include <lauxlib.h>
#include <lua.h>
#include <lualib.h>
#include <import/ebmbtree.h>
#include <haproxy/cli-t.h>
#include <haproxy/errors.h>
#include <haproxy/hlua.h>
#include <haproxy/hlua_fcn.h>
#include <haproxy/http.h>
#include <haproxy/net_helper.h>
#include <haproxy/pattern-t.h>
#include <haproxy/proxy.h>
#include <haproxy/regex.h>
#include <haproxy/server.h>
#include <haproxy/stats.h>
#include <haproxy/stick_table.h>
#include <haproxy/event_hdl.h>
#include <haproxy/stream-t.h>
#include <haproxy/time.h>
#include <haproxy/tools.h>
#include <haproxy/mailers.h>
/* Contains the class reference of the concat object. */
static int class_concat_ref;
static int class_queue_ref;
static int class_proxy_ref;
static int class_server_ref;
static int class_listener_ref;
static int class_event_sub_ref;
static int class_regex_ref;
static int class_stktable_ref;
static int class_proxy_list_ref;
static int class_server_list_ref;
#define STATS_LEN (MAX((int)ST_F_TOTAL_FIELDS, (int)INF_TOTAL_FIELDS))
static THREAD_LOCAL struct field stats[STATS_LEN];
int hlua_checkboolean(lua_State *L, int index)
{
if (!lua_isboolean(L, index))
luaL_argerror(L, index, "boolean expected");
return lua_toboolean(L, index);
}
/* Helper to push unsigned integers to Lua stack, respecting Lua limitations */
static int hlua_fcn_pushunsigned(lua_State *L, unsigned int val)
{
#if (LUA_MAXINTEGER == LLONG_MAX || ((LUA_MAXINTEGER == LONG_MAX) && (__WORDSIZE == 64)))
lua_pushinteger(L, val);
#else
if (val > INT_MAX)
lua_pushnumber(L, (lua_Number)val);
else
lua_pushinteger(L, (int)val);
#endif
return 1;
}
/* Helper to push unsigned long long to Lua stack, respecting Lua limitations */
static int hlua_fcn_pushunsigned_ll(lua_State *L, unsigned long long val) {
#if (LUA_MAXINTEGER == LLONG_MAX || ((LUA_MAXINTEGER == LONG_MAX) && (__WORDSIZE == 64)))
/* 64 bits case, U64 is supported until LLONG_MAX */
if (val > LLONG_MAX)
lua_pushnumber(L, (lua_Number)val);
else
lua_pushinteger(L, val);
#else
/* 32 bits case, U64 is supported until INT_MAX */
if (val > INT_MAX)
lua_pushnumber(L, (lua_Number)val);
else
lua_pushinteger(L, (int)val);
#endif
return 1;
}
/* This function gets a struct field and converts it in Lua
* variable. The variable is pushed at the top of the stack.
*/
int hlua_fcn_pushfield(lua_State *L, struct field *field)
{
/* The lua_Integer is always signed. Its length depends on
* compilation options, so the following code is conditioned
* by some macros. Windows maros are not supported.
* If the number cannot be represented as integer, we try to
* convert to float.
*/
switch (field_format(field, 0)) {
case FF_EMPTY:
lua_pushnil(L);
return 1;
case FF_S32:
/* S32 is always supported. */
lua_pushinteger(L, field->u.s32);
return 1;
case FF_U32:
#if (LUA_MAXINTEGER == LLONG_MAX || ((LUA_MAXINTEGER == LONG_MAX) && (__WORDSIZE == 64)))
/* 64 bits case, U32 is always supported */
lua_pushinteger(L, field->u.u32);
#else
/* 32 bits case, U32 is supported until INT_MAX. */
if (field->u.u32 > INT_MAX)
lua_pushnumber(L, (lua_Number)field->u.u32);
else
lua_pushinteger(L, field->u.u32);
#endif
return 1;
case FF_S64:
#if (LUA_MAXINTEGER == LLONG_MAX || ((LUA_MAXINTEGER == LONG_MAX) && (__WORDSIZE == 64)))
/* 64 bits case, S64 is always supported */
lua_pushinteger(L, field->u.s64);
#else
/* 64 bits case, S64 is supported between INT_MIN and INT_MAX */
if (field->u.s64 < INT_MIN || field->u.s64 > INT_MAX)
lua_pushnumber(L, (lua_Number)field->u.s64);
else
lua_pushinteger(L, (int)field->u.s64);
#endif
return 1;
case FF_U64:
#if (LUA_MAXINTEGER == LLONG_MAX || ((LUA_MAXINTEGER == LONG_MAX) && (__WORDSIZE == 64)))
/* 64 bits case, U64 is supported until LLONG_MAX */
if (field->u.u64 > LLONG_MAX)
lua_pushnumber(L, (lua_Number)field->u.u64);
else
lua_pushinteger(L, field->u.u64);
#else
/* 64 bits case, U64 is supported until INT_MAX */
if (field->u.u64 > INT_MAX)
lua_pushnumber(L, (lua_Number)field->u.u64);
else
lua_pushinteger(L, (int)field->u.u64);
#endif
return 1;
case FF_STR:
lua_pushstring(L, field->u.str);
return 1;
default:
break;
}
/* Default case, never reached. */
lua_pushnil(L);
return 1;
}
/* Some string are started or terminated by blank chars,
* this function removes the spaces, tabs, \r and
* \n at the begin and at the end of the string "str", and
* push the result in the lua stack.
* Returns a pointer to the Lua internal copy of the string.
*/
const char *hlua_pushstrippedstring(lua_State *L, const char *str)
{
const char *p;
int l;
for (p = str; HTTP_IS_LWS(*p); p++);
for (l = strlen(p); l && HTTP_IS_LWS(p[l-1]); l--);
return lua_pushlstring(L, p, l);
}
/* The three following functions are useful for adding entries
* in a table. These functions takes a string and respectively an
* integer, a string or a function and add it to the table in the
* top of the stack.
*
* These functions throws an error if no more stack size is
* available.
*/
void hlua_class_const_int(lua_State *L, const char *name, int value)
{
lua_pushstring(L, name);
lua_pushinteger(L, value);
lua_rawset(L, -3);
}
void hlua_class_const_str(lua_State *L, const char *name, const char *value)
{
lua_pushstring(L, name);
lua_pushstring(L, value);
lua_rawset(L, -3);
}
void hlua_class_function(lua_State *L, const char *name, int (*function)(lua_State *L))
{
lua_pushstring(L, name);
lua_pushcclosure(L, function, 0);
lua_rawset(L, -3);
}
/* This function returns a string containing the HAProxy object name. */
int hlua_dump_object(struct lua_State *L)
{
const char *name = (const char *)lua_tostring(L, lua_upvalueindex(1));
lua_pushfstring(L, "HAProxy class %s", name);
return 1;
}
/* This function register a table as metatable and. It names
* the metatable, and returns the associated reference.
* The original table is popped from the top of the stack.
* "name" is the referenced class name.
*/
int hlua_register_metatable(struct lua_State *L, char *name)
{
/* Check the type of the top element. it must be
* a table.
*/
if (lua_type(L, -1) != LUA_TTABLE)
luaL_error(L, "hlua_register_metatable() requires a type Table "
"in the top of the stack");
/* Add the __tostring function which identify the
* created object.
*/
lua_pushstring(L, "__tostring");
lua_pushstring(L, name);
lua_pushcclosure(L, hlua_dump_object, 1);
lua_rawset(L, -3);
/* Register a named entry for the table. The table
* reference is copied first because the function
* lua_setfield() pop the entry.
*/
lua_pushvalue(L, -1);
lua_setfield(L, LUA_REGISTRYINDEX, name);
/* Creates the reference of the object. The
* function luaL_ref pop the top of the stack.
*/
return luaL_ref(L, LUA_REGISTRYINDEX);
}
/* Return an object of the expected type, or throws an error. */
void *hlua_checkudata(lua_State *L, int ud, int class_ref)
{
void *p;
int ret;
/* Check if the stack entry is an array. */
if (!lua_istable(L, ud))
luaL_argerror(L, ud, NULL);
/* pop the metatable of the referencecd object. */
if (!lua_getmetatable(L, ud))
luaL_argerror(L, ud, NULL);
/* pop the expected metatable. */
lua_rawgeti(L, LUA_REGISTRYINDEX, class_ref);
/* Check if the metadata have the expected type. */
ret = lua_rawequal(L, -1, -2);
lua_pop(L, 2);
if (!ret)
luaL_argerror(L, ud, NULL);
/* Push on the stack at the entry [0] of the table. */
lua_rawgeti(L, ud, 0);
/* Check if this entry is userdata. */
p = lua_touserdata(L, -1);
if (!p)
luaL_argerror(L, ud, NULL);
/* Remove the entry returned by lua_rawgeti(). */
lua_pop(L, 1);
/* Return the associated struct. */
return p;
}
/* This function return the current date at epoch format in milliseconds. */
int hlua_now(lua_State *L)
{
/* WT: the doc says "returns the current time" and later says that it's
* monotonic. So the best fit is to use start_date+(now-start_time).
*/
struct timeval tv;
tv = NS_TO_TV(now_ns - start_time_ns);
tv_add(&tv, &tv, &start_date);
lua_newtable(L);
lua_pushstring(L, "sec");
lua_pushinteger(L, tv.tv_sec);
lua_rawset(L, -3);
lua_pushstring(L, "usec");
lua_pushinteger(L, tv.tv_usec);
lua_rawset(L, -3);
return 1;
}
/* This functions expects a Lua string as HTTP date, parse it and
* returns an integer containing the epoch format of the date, or
* nil if the parsing fails.
*/
static int hlua_parse_date(lua_State *L, int (*fcn)(const char *, int, struct tm*))
{
const char *str;
size_t len;
struct tm tm;
time_t time;
str = luaL_checklstring(L, 1, &len);
if (!fcn(str, len, &tm)) {
lua_pushnil(L);
return 1;
}
/* This function considers the content of the broken-down time
* is exprimed in the UTC timezone. timegm don't care about
* the gnu variable tm_gmtoff. If gmtoff is set, or if you know
* the timezone from the broken-down time, it must be fixed
* after the conversion.
*/
time = my_timegm(&tm);
if (time == -1) {
lua_pushnil(L);
return 1;
}
lua_pushinteger(L, (int)time);
return 1;
}
static int hlua_http_date(lua_State *L)
{
return hlua_parse_date(L, parse_http_date);
}
static int hlua_imf_date(lua_State *L)
{
return hlua_parse_date(L, parse_imf_date);
}
static int hlua_rfc850_date(lua_State *L)
{
return hlua_parse_date(L, parse_rfc850_date);
}
static int hlua_asctime_date(lua_State *L)
{
return hlua_parse_date(L, parse_asctime_date);
}
static int hlua_get_info(lua_State *L)
{
int i;
stats_fill_info(stats, STATS_LEN, 0);
lua_newtable(L);
for (i=0; i<INF_TOTAL_FIELDS; i++) {
lua_pushstring(L, info_fields[i].name);
hlua_fcn_pushfield(L, &stats[i]);
lua_settable(L, -3);
}
return 1;
}
static struct hlua_concat *hlua_check_concat(lua_State *L, int ud)
{
return (hlua_checkudata(L, ud, class_concat_ref));
}
static int hlua_concat_add(lua_State *L)
{
struct hlua_concat *b;
char *buffer;
char *new;
const char *str;
size_t l;
/* First arg must be a concat object. */
b = hlua_check_concat(L, 1);
/* Second arg must be a string. */
str = luaL_checklstring(L, 2, &l);
/* Get the buffer. */
lua_rawgeti(L, 1, 1);
buffer = lua_touserdata(L, -1);
lua_pop(L, 1);
/* Update the buffer size if it s required. The old buffer
* is crushed by the new in the object array, so it will
* be deleted by the GC.
* Note that in the first loop, the "new" variable is only
* used as a flag.
*/
new = NULL;
while (b->size - b->len < l) {
b->size += HLUA_CONCAT_BLOCSZ;
new = buffer;
}
if (new) {
new = lua_newuserdata(L, b->size);
memcpy(new, buffer, b->len);
lua_rawseti(L, 1, 1);
buffer = new;
}
/* Copy string, and update metadata. */
memcpy(buffer + b->len, str, l);
b->len += l;
return 0;
}
static int hlua_concat_dump(lua_State *L)
{
struct hlua_concat *b;
char *buffer;
/* First arg must be a concat object. */
b = hlua_check_concat(L, 1);
/* Get the buffer. */
lua_rawgeti(L, 1, 1);
buffer = lua_touserdata(L, -1);
lua_pop(L, 1);
/* Push the soncatenated string in the stack. */
lua_pushlstring(L, buffer, b->len);
return 1;
}
int hlua_concat_new(lua_State *L)
{
struct hlua_concat *b;
lua_newtable(L);
b = lua_newuserdata(L, sizeof(*b));
b->size = HLUA_CONCAT_BLOCSZ;
b->len = 0;
lua_rawseti(L, -2, 0);
lua_newuserdata(L, HLUA_CONCAT_BLOCSZ);
lua_rawseti(L, -2, 1);
lua_rawgeti(L, LUA_REGISTRYINDEX, class_concat_ref);
lua_setmetatable(L, -2);
return 1;
}
static int concat_tostring(lua_State *L)
{
const void *ptr = lua_topointer(L, 1);
lua_pushfstring(L, "Concat object: %p", ptr);
return 1;
}
static void hlua_concat_init(lua_State *L)
{
/* Creates the buffered concat object. */
lua_newtable(L);
lua_pushstring(L, "__tostring");
lua_pushcclosure(L, concat_tostring, 0);
lua_settable(L, -3);
lua_pushstring(L, "__index"); /* Creates the index entry. */
lua_newtable(L); /* The "__index" content. */
lua_pushstring(L, "add");
lua_pushcclosure(L, hlua_concat_add, 0);
lua_settable(L, -3);
lua_pushstring(L, "dump");
lua_pushcclosure(L, hlua_concat_dump, 0);
lua_settable(L, -3);
lua_settable(L, -3); /* Sets the __index entry. */
class_concat_ref = luaL_ref(L, LUA_REGISTRYINDEX);
}
/* C backing storage for lua Queue class */
struct hlua_queue {
uint32_t size;
struct mt_list list;
struct mt_list wait_tasks;
};
/* used to store lua objects in queue->list */
struct hlua_queue_item {
int ref; /* lua object reference id */
struct mt_list list;
};
/* used to store wait entries in queue->wait_tasks */
struct hlua_queue_wait
{
struct task *task;
struct mt_list entry;
};
/* This is the memory pool containing struct hlua_queue_item (queue items)
*/
DECLARE_STATIC_POOL(pool_head_hlua_queue, "hlua_queue", sizeof(struct hlua_queue_item));
/* This is the memory pool containing struct hlua_queue_wait
* (queue waiting tasks)
*/
DECLARE_STATIC_POOL(pool_head_hlua_queuew, "hlua_queuew", sizeof(struct hlua_queue_wait));
static struct hlua_queue *hlua_check_queue(lua_State *L, int ud)
{
return hlua_checkudata(L, ud, class_queue_ref);
}
/* queue:size(): returns an integer containing the current number of queued
* items.
*/
static int hlua_queue_size(lua_State *L)
{
struct hlua_queue *queue = hlua_check_queue(L, 1);
BUG_ON(!queue);
lua_pushinteger(L, HA_ATOMIC_LOAD(&queue->size));
return 1;
}
/* queue:push(): push an item (any type, except nil) at the end of the queue
*
* Returns boolean:true for success and boolean:false on error
*/
static int hlua_queue_push(lua_State *L)
{
struct hlua_queue *queue = hlua_check_queue(L, 1);
struct hlua_queue_item *item;
struct mt_list *elt1, elt2;
struct hlua_queue_wait *waiter;
if (lua_gettop(L) != 2 || lua_isnoneornil(L, 2)) {
luaL_error(L, "unexpected argument");
/* not reached */
return 0;
}
BUG_ON(!queue);
item = pool_alloc(pool_head_hlua_queue);
if (!item) {
/* memory error */
lua_pushboolean(L, 0);
return 1;
}
/* get a reference from lua object at the top of the stack */
item->ref = hlua_ref(L);
/* push new entry to the queue */
MT_LIST_INIT(&item->list);
HA_ATOMIC_INC(&queue->size);
MT_LIST_APPEND(&queue->list, &item->list);
/* notify tasks waiting on queue:pop_wait() (if any) */
mt_list_for_each_entry_safe(waiter, &queue->wait_tasks, entry, elt1, elt2) {
task_wakeup(waiter->task, TASK_WOKEN_MSG);
}
lua_pushboolean(L, 1);
return 1;
}
/* internal queue pop helper, returns 1 if it successfully popped an item
* from the queue and pushed it on lua stack.
*
* Else it returns 0 (nothing is pushed on the stack)
*/
static int _hlua_queue_pop(lua_State *L, struct hlua_queue *queue)
{
struct hlua_queue_item *item;
item = MT_LIST_POP(&queue->list, typeof(item), list);
if (!item)
return 0; /* nothing in queue */
HA_ATOMIC_DEC(&queue->size);
/* push lua obj on the stack */
hlua_pushref(L, item->ref);
/* obj ref should be released right away since it was pushed
* on the stack and will not be used anymore
*/
hlua_unref(L, item->ref);
/* free the queue item */
pool_free(pool_head_hlua_queue, item);
return 1;
}
/* queue:pop(): returns the first item at the top of que queue or nil if
* the queue is empty.
*/
static int hlua_queue_pop(lua_State *L)
{
struct hlua_queue *queue = hlua_check_queue(L, 1);
BUG_ON(!queue);
if (!_hlua_queue_pop(L, queue)) {
/* nothing in queue, push nil */
lua_pushnil(L);
}
return 1; /* either item or nil is at the top of the stack */
}
/* queue:pop_wait(): same as queue:pop() but doesn't return on empty queue.
*
* Aborts if used incorrectly and returns nil in case of memory error.
*/
static int _hlua_queue_pop_wait(lua_State *L, int status, lua_KContext ctx)
{
struct hlua_queue *queue = hlua_check_queue(L, 1);
struct hlua_queue_wait *wait = lua_touserdata(L, 2);
/* new pop attempt */
if (!_hlua_queue_pop(L, queue)) {
hlua_yieldk(L, 0, 0, _hlua_queue_pop_wait, TICK_ETERNITY, 0); // wait retry
return 0; // never reached, yieldk won't return
}
/* remove task from waiting list */
MT_LIST_DELETE(&wait->entry);
pool_free(pool_head_hlua_queuew, wait);
return 1; // success
}
static int hlua_queue_pop_wait(lua_State *L)
{
struct hlua_queue *queue = hlua_check_queue(L, 1);
struct hlua_queue_wait *wait;
struct hlua *hlua;
BUG_ON(!queue);
/* Get hlua struct, or NULL if we execute from main lua state */
hlua = hlua_gethlua(L);
if (!hlua || HLUA_CANT_YIELD(hlua)) {
luaL_error(L, "pop_wait() may only be used within task context "
"(requires yielding)");
return 0; /* not reached */
}
/* try opportunistic pop (there could already be pending items) */
if (_hlua_queue_pop(L, queue))
return 1; // success
/* no pending items, waiting required */
wait = pool_alloc(pool_head_hlua_queuew);
if (!wait) {
lua_pushnil(L);
return 1; /* memory error, return nil */
}
wait->task = hlua->task;
MT_LIST_INIT(&wait->entry);
/* add task to queue's wait list */
MT_LIST_TRY_APPEND(&queue->wait_tasks, &wait->entry);
/* push wait entry at index 2 on the stack (queue is already there) */
lua_pushlightuserdata(L, wait);
/* Go to waiting loop which immediately performs a new attempt to make
* sure we didn't miss a push during the wait entry initialization.
*
* _hlua_queue_pop_wait() won't return to us if it has to yield, which
* is the most likely scenario. What happens in this case is that yieldk
* call never returns, and instead Lua will call the continuation
* function after a successful resume, so the calling function will
* no longer be us, but Lua instead. And when the continuation function
* eventually returns (because it successfully popped an item), Lua will
* directly give the hand back to the Lua function that called us.
*
* More info here: https://www.lua.org/manual/5.4/manual.html#4.7
*/
return _hlua_queue_pop_wait(L, LUA_OK, 0);
}
static int hlua_queue_new(lua_State *L)
{
struct hlua_queue *q;
lua_newtable(L);
/* set class metatable */
lua_rawgeti(L, LUA_REGISTRYINDEX, class_queue_ref);
lua_setmetatable(L, -2);
/* index:0 is queue userdata (c data) */
q = lua_newuserdata(L, sizeof(*q));
MT_LIST_INIT(&q->list);
MT_LIST_INIT(&q->wait_tasks);
q->size = 0;
lua_rawseti(L, -2, 0);
/* class methods */
hlua_class_function(L, "size", hlua_queue_size);
hlua_class_function(L, "pop", hlua_queue_pop);
hlua_class_function(L, "pop_wait", hlua_queue_pop_wait);
hlua_class_function(L, "push", hlua_queue_push);
return 1;
}
static int hlua_queue_gc(struct lua_State *L)
{
struct hlua_queue *queue = hlua_check_queue(L, 1);
struct hlua_queue_wait *wait;
struct hlua_queue_item *item;
/* Purge waiting tasks (if any)
*
* It is normally not expected to have waiting tasks, except if such
* task has been aborted while in the middle of a queue:pop_wait()
* function call.
*/
while ((wait = MT_LIST_POP(&queue->wait_tasks, typeof(wait), entry))) {
/* free the wait entry */
pool_free(pool_head_hlua_queuew, wait);
}
/* purge remaining (unconsumed) items in the queue */
while ((item = MT_LIST_POP(&queue->list, typeof(item), list))) {
/* free the queue item */
pool_free(pool_head_hlua_queue, item);
}
/* queue (userdata) will automatically be freed by lua gc */
return 0;
}
static void hlua_queue_init(lua_State *L)
{
/* Creates the queue object. */
lua_newtable(L);
hlua_class_function(L, "__gc", hlua_queue_gc);
class_queue_ref = luaL_ref(L, LUA_REGISTRYINDEX);
}
int hlua_fcn_new_stktable(lua_State *L, struct stktable *tbl)
{
lua_newtable(L);
/* Pop a class stktbl metatable and affect it to the userdata. */
lua_rawgeti(L, LUA_REGISTRYINDEX, class_stktable_ref);
lua_setmetatable(L, -2);
lua_pushlightuserdata(L, tbl);
lua_rawseti(L, -2, 0);
return 1;
}
static struct stktable *hlua_check_stktable(lua_State *L, int ud)
{
return hlua_checkudata(L, ud, class_stktable_ref);
}
/* Extract stick table attributes into Lua table */
int hlua_stktable_info(lua_State *L)
{
struct stktable *tbl;
int dt;
tbl = hlua_check_stktable(L, 1);
if (!tbl->id) {
lua_pushnil(L);
return 1;
}
lua_newtable(L);
lua_pushstring(L, "type");
lua_pushstring(L, stktable_types[tbl->type].kw);
lua_settable(L, -3);
lua_pushstring(L, "length");
lua_pushinteger(L, tbl->key_size);
lua_settable(L, -3);
lua_pushstring(L, "size");
hlua_fcn_pushunsigned(L, tbl->size);
lua_settable(L, -3);
lua_pushstring(L, "used");
hlua_fcn_pushunsigned(L, tbl->current);
lua_settable(L, -3);
lua_pushstring(L, "nopurge");
lua_pushboolean(L, tbl->nopurge > 0);
lua_settable(L, -3);
lua_pushstring(L, "expire");
lua_pushinteger(L, tbl->expire);
lua_settable(L, -3);
/* Save data types periods (if applicable) in 'data' table */
lua_pushstring(L, "data");
lua_newtable(L);
for (dt = 0; dt < STKTABLE_DATA_TYPES; dt++) {
if (tbl->data_ofs[dt] == 0)
continue;
lua_pushstring(L, stktable_data_types[dt].name);
if (stktable_data_types[dt].arg_type == ARG_T_DELAY)
lua_pushinteger(L, tbl->data_arg[dt].u);
else
lua_pushinteger(L, -1);
lua_settable(L, -3);
}
lua_settable(L, -3);
return 1;
}
/* Helper to get extract stick table entry into Lua table */
static void hlua_stktable_entry(lua_State *L, struct stktable *t, struct stksess *ts)
{
int dt;
void *ptr;
for (dt = 0; dt < STKTABLE_DATA_TYPES; dt++) {
ptr = stktable_data_ptr(t, ts, dt);
if (!ptr)
continue;
lua_pushstring(L, stktable_data_types[dt].name);
switch (stktable_data_types[dt].std_type) {
case STD_T_SINT:
lua_pushinteger(L, stktable_data_cast(ptr, std_t_sint));
break;
case STD_T_UINT:
hlua_fcn_pushunsigned(L, stktable_data_cast(ptr, std_t_uint));
break;
case STD_T_ULL:
hlua_fcn_pushunsigned_ll(L, stktable_data_cast(ptr, std_t_ull));
break;
case STD_T_FRQP:
lua_pushinteger(L, read_freq_ctr_period(&stktable_data_cast(ptr, std_t_frqp),
t->data_arg[dt].u));
break;
case STD_T_DICT: {
struct dict_entry *de;
de = stktable_data_cast(ptr, std_t_dict);
lua_pushstring(L, de ? (char *)de->value.key : "-");
break;
}
}
lua_settable(L, -3);
}
}
/* Looks in table <t> for a sticky session matching key <key>
* Returns table with session data or nil
*
* The returned table always contains 'use' and 'expire' (integer) fields.
* For frequency/rate counters, each data entry is returned as table with
* 'value' and 'period' fields.
*/
int hlua_stktable_lookup(lua_State *L)
{
struct stktable *t;
struct sample smp;
struct stktable_key *skey;
struct stksess *ts;
t = hlua_check_stktable(L, 1);
smp.data.type = SMP_T_STR;
smp.flags = SMP_F_CONST;
smp.data.u.str.area = (char *)lua_tolstring(L, 2, &smp.data.u.str.data);
skey = smp_to_stkey(&smp, t);
if (!skey) {
lua_pushnil(L);
return 1;
}
ts = stktable_lookup_key(t, skey);
if (!ts) {
lua_pushnil(L);
return 1;
}
lua_newtable(L);
lua_pushstring(L, "use");
lua_pushinteger(L, HA_ATOMIC_LOAD(&ts->ref_cnt) - 1);
lua_settable(L, -3);
lua_pushstring(L, "expire");
lua_pushinteger(L, tick_remain(now_ms, ts->expire));
lua_settable(L, -3);
hlua_stktable_entry(L, t, ts);
HA_ATOMIC_DEC(&ts->ref_cnt);
return 1;
}
struct stk_filter {
long long val;
int type;
int op;
};
/* Helper for returning errors to callers using Lua convention (nil, err) */
static int hlua_error(lua_State *L, const char *fmt, ...) {
char buf[256];
int len;
va_list args;
va_start(args, fmt);
len = vsnprintf(buf, sizeof(buf), fmt, args);
va_end(args);
if (len < 0) {
ha_alert("hlua_error(): Could not write error message.\n");
lua_pushnil(L);
return 1;
} else if (len >= sizeof(buf))
ha_alert("hlua_error(): Error message was truncated.\n");
lua_pushnil(L);
lua_pushstring(L, buf);
return 2;
}
/* Dump the contents of stick table <t>*/
int hlua_stktable_dump(lua_State *L)
{
struct stktable *t;
struct ebmb_node *eb;
struct ebmb_node *n;
struct stksess *ts;
int type;
int op;
int dt;
long long val;
struct stk_filter filter[STKTABLE_FILTER_LEN];
int filter_count = 0;
int i;
int skip_entry;
void *ptr;
t = hlua_check_stktable(L, 1);
type = lua_type(L, 2);
switch (type) {
case LUA_TNONE:
case LUA_TNIL:
break;
case LUA_TTABLE:
lua_pushnil(L);
while (lua_next(L, 2) != 0) {
int entry_idx = 0;
if (filter_count >= STKTABLE_FILTER_LEN)
return hlua_error(L, "Filter table too large (len > %d)", STKTABLE_FILTER_LEN);
if (lua_type(L, -1) != LUA_TTABLE || lua_rawlen(L, -1) != 3)
return hlua_error(L, "Filter table entry must be a triplet: {\"data_col\", \"op\", val} (entry #%d)", filter_count + 1);
lua_pushnil(L);
while (lua_next(L, -2) != 0) {
switch (entry_idx) {
case 0:
if (lua_type(L, -1) != LUA_TSTRING)
return hlua_error(L, "Filter table data column must be string (entry #%d)", filter_count + 1);
dt = stktable_get_data_type((char *)lua_tostring(L, -1));
if (dt < 0 || t->data_ofs[dt] == 0)
return hlua_error(L, "Filter table data column not present in stick table (entry #%d)", filter_count + 1);
filter[filter_count].type = dt;
break;
case 1:
if (lua_type(L, -1) != LUA_TSTRING)
return hlua_error(L, "Filter table operator must be string (entry #%d)", filter_count + 1);
op = get_std_op(lua_tostring(L, -1));
if (op < 0)
return hlua_error(L, "Unknown operator in filter table (entry #%d)", filter_count + 1);
filter[filter_count].op = op;
break;
case 2:
val = lua_tointeger(L, -1);
filter[filter_count].val = val;
filter_count++;
break;
default:
break;
}
entry_idx++;
lua_pop(L, 1);
}
lua_pop(L, 1);
}
break;
default:
return hlua_error(L, "filter table expected");
}
lua_newtable(L);
HA_RWLOCK_WRLOCK(STK_TABLE_LOCK, &t->lock);
eb = ebmb_first(&t->keys);
for (n = eb; n; n = ebmb_next(n)) {
ts = ebmb_entry(n, struct stksess, key);
if (!ts) {
HA_RWLOCK_WRUNLOCK(STK_TABLE_LOCK, &t->lock);
return 1;
}
HA_ATOMIC_INC(&ts->ref_cnt);
HA_RWLOCK_WRUNLOCK(STK_TABLE_LOCK, &t->lock);
/* multi condition/value filter */
skip_entry = 0;
for (i = 0; i < filter_count; i++) {
ptr = stktable_data_ptr(t, ts, filter[i].type);
if (!ptr)
continue;
switch (stktable_data_types[filter[i].type].std_type) {
case STD_T_SINT:
val = stktable_data_cast(ptr, std_t_sint);
break;
case STD_T_UINT:
val = stktable_data_cast(ptr, std_t_uint);
break;
case STD_T_ULL:
val = stktable_data_cast(ptr, std_t_ull);
break;
case STD_T_FRQP:
val = read_freq_ctr_period(&stktable_data_cast(ptr, std_t_frqp),
t->data_arg[filter[i].type].u);
break;
default:
continue;
break;
}
op = filter[i].op;
if ((val < filter[i].val && (op == STD_OP_EQ || op == STD_OP_GT || op == STD_OP_GE)) ||
(val == filter[i].val && (op == STD_OP_NE || op == STD_OP_GT || op == STD_OP_LT)) ||
(val > filter[i].val && (op == STD_OP_EQ || op == STD_OP_LT || op == STD_OP_LE))) {
skip_entry = 1;
break;
}
}
if (skip_entry) {
HA_RWLOCK_WRLOCK(STK_TABLE_LOCK, &t->lock);
HA_ATOMIC_DEC(&ts->ref_cnt);
continue;
}
if (t->type == SMP_T_IPV4) {
char addr[INET_ADDRSTRLEN];
inet_ntop(AF_INET, (const void *)&ts->key.key, addr, sizeof(addr));
lua_pushstring(L, addr);
} else if (t->type == SMP_T_IPV6) {
char addr[INET6_ADDRSTRLEN];
inet_ntop(AF_INET6, (const void *)&ts->key.key, addr, sizeof(addr));
lua_pushstring(L, addr);
} else if (t->type == SMP_T_SINT) {
lua_pushinteger(L, *ts->key.key);
} else if (t->type == SMP_T_STR) {
lua_pushstring(L, (const char *)ts->key.key);
} else {
return hlua_error(L, "Unsupported stick table key type");
}
lua_newtable(L);
hlua_stktable_entry(L, t, ts);
lua_settable(L, -3);
HA_RWLOCK_WRLOCK(STK_TABLE_LOCK, &t->lock);
HA_ATOMIC_DEC(&ts->ref_cnt);
}
HA_RWLOCK_WRUNLOCK(STK_TABLE_LOCK, &t->lock);
return 1;
}
int hlua_fcn_new_listener(lua_State *L, struct listener *lst)
{
lua_newtable(L);
/* Pop a class sesison metatable and affect it to the userdata. */
lua_rawgeti(L, LUA_REGISTRYINDEX, class_listener_ref);
lua_setmetatable(L, -2);
lua_pushlightuserdata(L, lst);
lua_rawseti(L, -2, 0);
return 1;
}
static struct listener *hlua_check_listener(lua_State *L, int ud)
{
return hlua_checkudata(L, ud, class_listener_ref);
}
int hlua_listener_get_stats(lua_State *L)
{
struct listener *li;
int i;
li = hlua_check_listener(L, 1);
if (!li->bind_conf->frontend) {
lua_pushnil(L);
return 1;
}
stats_fill_li_stats(li->bind_conf->frontend, li, STAT_SHLGNDS, stats,
STATS_LEN, NULL);
lua_newtable(L);
for (i=0; i<ST_F_TOTAL_FIELDS; i++) {
lua_pushstring(L, stat_fields[i].name);
hlua_fcn_pushfield(L, &stats[i]);
lua_settable(L, -3);
}
return 1;
}
int hlua_server_gc(lua_State *L)
{
struct server *srv = hlua_checkudata(L, 1, class_server_ref);
srv_drop(srv); /* srv_drop allows NULL srv */
return 0;
}
static struct server *hlua_check_server(lua_State *L, int ud)
{
struct server *srv = hlua_checkudata(L, ud, class_server_ref);
if (srv->flags & SRV_F_DELETED) {
return NULL;
}
return srv;
}
int hlua_server_get_stats(lua_State *L)
{
struct server *srv;
int i;
srv = hlua_check_server(L, 1);
if (srv == NULL) {
lua_pushnil(L);
return 1;
}
if (!srv->proxy) {
lua_pushnil(L);
return 1;
}
stats_fill_sv_stats(srv->proxy, srv, STAT_SHLGNDS, stats,
STATS_LEN, NULL);
lua_newtable(L);
for (i=0; i<ST_F_TOTAL_FIELDS; i++) {
lua_pushstring(L, stat_fields[i].name);
hlua_fcn_pushfield(L, &stats[i]);
lua_settable(L, -3);
}
return 1;
}
int hlua_server_get_proxy(lua_State *L)
{
struct server *srv;
srv = hlua_check_server(L, 1);
if (srv == NULL) {
lua_pushnil(L);
return 1;
}
if (!srv->proxy) {
lua_pushnil(L);
return 1;
}
hlua_fcn_new_proxy(L, srv->proxy);
return 1;
}
int hlua_server_get_addr(lua_State *L)
{
struct server *srv;
char addr[INET6_ADDRSTRLEN];
luaL_Buffer b;
srv = hlua_check_server(L, 1);
if (srv == NULL) {
lua_pushnil(L);
return 1;
}
luaL_buffinit(L, &b);
switch (srv->addr.ss_family) {
case AF_INET:
inet_ntop(AF_INET, &((struct sockaddr_in *)&srv->addr)->sin_addr,
addr, INET_ADDRSTRLEN);
luaL_addstring(&b, addr);
luaL_addstring(&b, ":");
snprintf(addr, INET_ADDRSTRLEN, "%d", srv->svc_port);
luaL_addstring(&b, addr);
break;
case AF_INET6:
inet_ntop(AF_INET6, &((struct sockaddr_in6 *)&srv->addr)->sin6_addr,
addr, INET6_ADDRSTRLEN);
luaL_addstring(&b, addr);
luaL_addstring(&b, ":");
snprintf(addr, INET_ADDRSTRLEN, "%d", srv->svc_port);
luaL_addstring(&b, addr);
break;
case AF_UNIX:
luaL_addstring(&b, (char *)((struct sockaddr_un *)&srv->addr)->sun_path);
break;
default:
luaL_addstring(&b, "<unknown>");
break;
}
luaL_pushresult(&b);
return 1;
}
int hlua_server_get_puid(lua_State *L)
{
struct server *srv;
char buffer[12];
srv = hlua_check_server(L, 1);
if (srv == NULL) {
lua_pushnil(L);
return 1;
}
snprintf(buffer, sizeof(buffer), "%d", srv->puid);
lua_pushstring(L, buffer);
return 1;
}
int hlua_server_get_rid(lua_State *L)
{
struct server *srv;
char buffer[12];
srv = hlua_check_server(L, 1);
if (srv == NULL) {
lua_pushnil(L);
return 1;
}
snprintf(buffer, sizeof(buffer), "%d", srv->rid);
lua_pushstring(L, buffer);
return 1;
}
int hlua_server_get_name(lua_State *L)
{
struct server *srv;
srv = hlua_check_server(L, 1);
if (srv == NULL) {
lua_pushnil(L);
return 1;
}
lua_pushstring(L, srv->id);
return 1;
}
/* __index metamethod for server class
* support for additional keys that are missing from the main table
* stack:1 = table (server class), stack:2 = requested key
* Returns 1 if key is supported
* else returns 0 to make lua return NIL value to the caller
*/
static int hlua_server_index(struct lua_State *L)
{
const char *key = lua_tostring(L, 2);
if (!strcmp(key, "name")) {
if (ONLY_ONCE())
ha_warning("hlua: use of server 'name' attribute is deprecated and will eventually be removed, please use get_name() function instead: %s\n", hlua_traceback(L, ", "));
lua_pushvalue(L, 1);
hlua_server_get_name(L);
return 1;
}
if (!strcmp(key, "puid")) {
if (ONLY_ONCE())
ha_warning("hlua: use of server 'puid' attribute is deprecated and will eventually be removed, please use get_puid() function instead: %s\n", hlua_traceback(L, ", "));
lua_pushvalue(L, 1);
hlua_server_get_puid(L);
return 1;
}
/* unknown attribute */
return 0;
}
int hlua_server_is_draining(lua_State *L)
{
struct server *srv;
srv = hlua_check_server(L, 1);
if (srv == NULL) {
lua_pushnil(L);
return 1;
}
lua_pushboolean(L, server_is_draining(srv));
return 1;
}
int hlua_server_is_backup(lua_State *L)
{
struct server *srv;
srv = hlua_check_server(L, 1);
if (srv == NULL) {
lua_pushnil(L);
return 1;
}
lua_pushboolean(L, (srv->flags & SRV_F_BACKUP));
return 1;
}
int hlua_server_is_dynamic(lua_State *L)
{
struct server *srv;
srv = hlua_check_server(L, 1);
if (srv == NULL) {
lua_pushnil(L);
return 1;
}
lua_pushboolean(L, (srv->flags & SRV_F_DYNAMIC));
return 1;
}
int hlua_server_get_cur_sess(lua_State *L)
{
struct server *srv;
srv = hlua_check_server(L, 1);
if (srv == NULL) {
lua_pushnil(L);
return 1;
}
lua_pushinteger(L, srv->cur_sess);
return 1;
}
int hlua_server_get_pend_conn(lua_State *L)
{
struct server *srv;
srv = hlua_check_server(L, 1);
if (srv == NULL) {
lua_pushnil(L);
return 1;
}
lua_pushinteger(L, srv->queue.length);
return 1;
}
int hlua_server_set_maxconn(lua_State *L)
{
struct server *srv;
const char *maxconn;
const char *err;
srv = hlua_check_server(L, 1);
if (srv == NULL) {
lua_pushnil(L);
return 1;
}
maxconn = luaL_checkstring(L, 2);
HA_SPIN_LOCK(SERVER_LOCK, &srv->lock);
err = server_parse_maxconn_change_request(srv, maxconn);
HA_SPIN_UNLOCK(SERVER_LOCK, &srv->lock);
if (!err)
lua_pushnil(L);
else
hlua_pushstrippedstring(L, err);
return 1;
}
int hlua_server_get_maxconn(lua_State *L)
{
struct server *srv;
srv = hlua_check_server(L, 1);
if (srv == NULL) {
lua_pushnil(L);
return 1;
}
lua_pushinteger(L, srv->maxconn);
return 1;
}
int hlua_server_set_weight(lua_State *L)
{
struct server *srv;
const char *weight;
const char *err;
srv = hlua_check_server(L, 1);
if (srv == NULL) {
lua_pushnil(L);
return 1;
}
weight = luaL_checkstring(L, 2);
HA_SPIN_LOCK(SERVER_LOCK, &srv->lock);
err = server_parse_weight_change_request(srv, weight);
HA_SPIN_UNLOCK(SERVER_LOCK, &srv->lock);
if (!err)
lua_pushnil(L);
else
hlua_pushstrippedstring(L, err);
return 1;
}
int hlua_server_get_weight(lua_State *L)
{
struct server *srv;
srv = hlua_check_server(L, 1);
if (srv == NULL) {
lua_pushnil(L);
return 1;
}
lua_pushinteger(L, srv->uweight);
return 1;
}
int hlua_server_set_addr(lua_State *L)
{
struct server *srv;
const char *addr;
const char *port;
const char *err;
srv = hlua_check_server(L, 1);
if (srv == NULL) {
lua_pushnil(L);
return 1;
}
addr = luaL_checkstring(L, 2);
if (lua_gettop(L) >= 3)
port = luaL_checkstring(L, 3);
else
port = NULL;
HA_SPIN_LOCK(SERVER_LOCK, &srv->lock);
err = srv_update_addr_port(srv, addr, port, "Lua script");
HA_SPIN_UNLOCK(SERVER_LOCK, &srv->lock);
if (!err)
lua_pushnil(L);
else
hlua_pushstrippedstring(L, err);
return 1;
}
int hlua_server_shut_sess(lua_State *L)
{
struct server *srv;
srv = hlua_check_server(L, 1);
if (srv == NULL) {
return 0;
}
HA_SPIN_LOCK(SERVER_LOCK, &srv->lock);
srv_shutdown_streams(srv, SF_ERR_KILLED);
HA_SPIN_UNLOCK(SERVER_LOCK, &srv->lock);
return 0;
}
int hlua_server_set_drain(lua_State *L)
{
struct server *srv;
srv = hlua_check_server(L, 1);
if (srv == NULL) {
return 0;
}
HA_SPIN_LOCK(SERVER_LOCK, &srv->lock);
srv_adm_set_drain(srv);
HA_SPIN_UNLOCK(SERVER_LOCK, &srv->lock);
return 0;
}
int hlua_server_set_maint(lua_State *L)
{
struct server *srv;
srv = hlua_check_server(L, 1);
if (srv == NULL) {
return 0;
}
HA_SPIN_LOCK(SERVER_LOCK, &srv->lock);
srv_adm_set_maint(srv);
HA_SPIN_UNLOCK(SERVER_LOCK, &srv->lock);
return 0;
}
int hlua_server_set_ready(lua_State *L)
{
struct server *srv;
srv = hlua_check_server(L, 1);
if (srv == NULL) {
return 0;
}
HA_SPIN_LOCK(SERVER_LOCK, &srv->lock);
srv_adm_set_ready(srv);
HA_SPIN_UNLOCK(SERVER_LOCK, &srv->lock);
return 0;
}
int hlua_server_check_enable(lua_State *L)
{
struct server *sv;
sv = hlua_check_server(L, 1);
if (sv == NULL) {
return 0;
}
HA_SPIN_LOCK(SERVER_LOCK, &sv->lock);
if (sv->check.state & CHK_ST_CONFIGURED) {
sv->check.state |= CHK_ST_ENABLED;
}
HA_SPIN_UNLOCK(SERVER_LOCK, &sv->lock);
return 0;
}
int hlua_server_check_disable(lua_State *L)
{
struct server *sv;
sv = hlua_check_server(L, 1);
if (sv == NULL) {
return 0;
}
HA_SPIN_LOCK(SERVER_LOCK, &sv->lock);
if (sv->check.state & CHK_ST_CONFIGURED) {
sv->check.state &= ~CHK_ST_ENABLED;
}
HA_SPIN_UNLOCK(SERVER_LOCK, &sv->lock);
return 0;
}
int hlua_server_check_force_up(lua_State *L)
{
struct server *sv;
sv = hlua_check_server(L, 1);
if (sv == NULL) {
return 0;
}
HA_SPIN_LOCK(SERVER_LOCK, &sv->lock);
if (!(sv->track)) {
sv->check.health = sv->check.rise + sv->check.fall - 1;
srv_set_running(sv, SRV_OP_STCHGC_LUA);
}
HA_SPIN_UNLOCK(SERVER_LOCK, &sv->lock);
return 0;
}
int hlua_server_check_force_nolb(lua_State *L)
{
struct server *sv;
sv = hlua_check_server(L, 1);
if (sv == NULL) {
return 0;
}
HA_SPIN_LOCK(SERVER_LOCK, &sv->lock);
if (!(sv->track)) {
sv->check.health = sv->check.rise + sv->check.fall - 1;
srv_set_stopping(sv, SRV_OP_STCHGC_LUA);
}
HA_SPIN_UNLOCK(SERVER_LOCK, &sv->lock);
return 0;
}
int hlua_server_check_force_down(lua_State *L)
{
struct server *sv;
sv = hlua_check_server(L, 1);
if (sv == NULL) {
return 0;
}
HA_SPIN_LOCK(SERVER_LOCK, &sv->lock);
if (!(sv->track)) {
sv->check.health = 0;
srv_set_stopped(sv, SRV_OP_STCHGC_LUA);
}
HA_SPIN_UNLOCK(SERVER_LOCK, &sv->lock);
return 0;
}
int hlua_server_agent_enable(lua_State *L)
{
struct server *sv;
sv = hlua_check_server(L, 1);
if (sv == NULL) {
return 0;
}
HA_SPIN_LOCK(SERVER_LOCK, &sv->lock);
if (sv->agent.state & CHK_ST_CONFIGURED) {
sv->agent.state |= CHK_ST_ENABLED;
}
HA_SPIN_UNLOCK(SERVER_LOCK, &sv->lock);
return 0;
}
int hlua_server_agent_disable(lua_State *L)
{
struct server *sv;
sv = hlua_check_server(L, 1);
if (sv == NULL) {
return 0;
}
HA_SPIN_LOCK(SERVER_LOCK, &sv->lock);
if (sv->agent.state & CHK_ST_CONFIGURED) {
sv->agent.state &= ~CHK_ST_ENABLED;
}
HA_SPIN_UNLOCK(SERVER_LOCK, &sv->lock);
return 0;
}
int hlua_server_agent_force_up(lua_State *L)
{
struct server *sv;
sv = hlua_check_server(L, 1);
if (sv == NULL) {
return 0;
}
HA_SPIN_LOCK(SERVER_LOCK, &sv->lock);
if (sv->agent.state & CHK_ST_ENABLED) {
sv->agent.health = sv->agent.rise + sv->agent.fall - 1;
srv_set_running(sv, SRV_OP_STCHGC_LUA);
}
HA_SPIN_UNLOCK(SERVER_LOCK, &sv->lock);
return 0;
}
int hlua_server_agent_force_down(lua_State *L)
{
struct server *sv;
sv = hlua_check_server(L, 1);
if (sv == NULL) {
return 0;
}
HA_SPIN_LOCK(SERVER_LOCK, &sv->lock);
if (sv->agent.state & CHK_ST_ENABLED) {
sv->agent.health = 0;
srv_set_stopped(sv, SRV_OP_STCHGC_LUA);
}
HA_SPIN_UNLOCK(SERVER_LOCK, &sv->lock);
return 0;
}
/* returns the tracked server, if any */
int hlua_server_tracking(lua_State *L)
{
struct server *sv;
struct server *tracked;
sv = hlua_check_server(L, 1);
if (sv == NULL) {
return 0;
}
tracked = sv->track;
if (tracked == NULL)
lua_pushnil(L);
else
hlua_fcn_new_server(L, tracked);
return 1;
}
/* returns an array of servers tracking the current server */
int hlua_server_get_trackers(lua_State *L)
{
struct server *sv;
struct server *cur_tracker;
int index;
sv = hlua_check_server(L, 1);
if (sv == NULL) {
return 0;
}
lua_newtable(L);
cur_tracker = sv->trackers;
for (index = 1; cur_tracker; cur_tracker = cur_tracker->tracknext, index++) {
if (!lua_checkstack(L, 5))
luaL_error(L, "Lua out of memory error.");
hlua_fcn_new_server(L, cur_tracker);
/* array index starts at 1 in Lua */
lua_rawseti(L, -2, index);
}
return 1;
}
/* hlua_event_sub wrapper for per-server subscription:
*
* hlua_event_sub() is called with sv->e_subs subscription list and
* lua arguments are passed as-is (skipping the first argument which
* is the server ctx)
*/
int hlua_server_event_sub(lua_State *L)
{
struct server *sv;
sv = hlua_check_server(L, 1);
if (sv == NULL) {
return 0;
}
/* remove first argument from the stack (server) */
lua_remove(L, 1);
/* try to subscribe within server's subscription list */
return hlua_event_sub(L, &sv->e_subs);
}
int hlua_fcn_new_server(lua_State *L, struct server *srv)
{
lua_newtable(L);
/* Pop a class server metatable and affect it to the userdata. */
lua_rawgeti(L, LUA_REGISTRYINDEX, class_server_ref);
lua_setmetatable(L, -2);
lua_pushlightuserdata(L, srv);
lua_rawseti(L, -2, 0);
/* userdata is affected: increment server refcount */
srv_take(srv);
/* set public methods */
hlua_class_function(L, "get_name", hlua_server_get_name);
hlua_class_function(L, "get_puid", hlua_server_get_puid);
hlua_class_function(L, "get_rid", hlua_server_get_rid);
hlua_class_function(L, "is_draining", hlua_server_is_draining);
hlua_class_function(L, "is_backup", hlua_server_is_backup);
hlua_class_function(L, "is_dynamic", hlua_server_is_dynamic);
hlua_class_function(L, "get_cur_sess", hlua_server_get_cur_sess);
hlua_class_function(L, "get_pend_conn", hlua_server_get_pend_conn);
hlua_class_function(L, "set_maxconn", hlua_server_set_maxconn);
hlua_class_function(L, "get_maxconn", hlua_server_get_maxconn);
hlua_class_function(L, "set_weight", hlua_server_set_weight);
hlua_class_function(L, "get_weight", hlua_server_get_weight);
hlua_class_function(L, "set_addr", hlua_server_set_addr);
hlua_class_function(L, "get_addr", hlua_server_get_addr);
hlua_class_function(L, "get_stats", hlua_server_get_stats);
hlua_class_function(L, "get_proxy", hlua_server_get_proxy);
hlua_class_function(L, "shut_sess", hlua_server_shut_sess);
hlua_class_function(L, "set_drain", hlua_server_set_drain);
hlua_class_function(L, "set_maint", hlua_server_set_maint);
hlua_class_function(L, "set_ready", hlua_server_set_ready);
hlua_class_function(L, "check_enable", hlua_server_check_enable);
hlua_class_function(L, "check_disable", hlua_server_check_disable);
hlua_class_function(L, "check_force_up", hlua_server_check_force_up);
hlua_class_function(L, "check_force_nolb", hlua_server_check_force_nolb);
hlua_class_function(L, "check_force_down", hlua_server_check_force_down);
hlua_class_function(L, "agent_enable", hlua_server_agent_enable);
hlua_class_function(L, "agent_disable", hlua_server_agent_disable);
hlua_class_function(L, "agent_force_up", hlua_server_agent_force_up);
hlua_class_function(L, "agent_force_down", hlua_server_agent_force_down);
hlua_class_function(L, "tracking", hlua_server_tracking);
hlua_class_function(L, "get_trackers", hlua_server_get_trackers);
hlua_class_function(L, "event_sub", hlua_server_event_sub);
return 1;
}
static struct hlua_server_list *hlua_check_server_list(lua_State *L, int ud)
{
return hlua_checkudata(L, ud, class_server_list_ref);
}
/* does nothing and returns 0, only prevents insertions in the
* table which represents the list of servers
*/
int hlua_listable_servers_newindex(lua_State *L) {
return 0;
}
/* first arg is the table (struct hlua_server_list * in metadata)
* second arg is the required index
*/
int hlua_listable_servers_index(lua_State *L)
{
struct hlua_server_list *hlua_srv;
const char *name;
struct server *srv;
hlua_srv = hlua_check_server_list(L, 1);
name = luaL_checkstring(L, 2);
/* Perform a server lookup in px list */
srv = server_find_by_name(hlua_srv->px, name);
if (srv == NULL) {
lua_pushnil(L);
return 1;
}
hlua_fcn_new_server(L, srv);
return 1;
}
/* iterator must return key as string and value as server
* object, if we reach end of list, it returns nil.
* The context knows the last returned server. if the
* context contains srv == NULL, we start enumeration.
* Then, use 'srv->next' ptr to iterate through the list
*/
int hlua_listable_servers_pairs_iterator(lua_State *L)
{
int context_index;
struct hlua_server_list_iterator_context *ctx;
context_index = lua_upvalueindex(1);
ctx = lua_touserdata(L, context_index);
if (ctx->cur == NULL) {
/* First iteration, initialize list on the first server */
ctx->cur = ctx->px->srv;
} else {
/* Next server (next ptr is always valid, even if current
* server has the SRV_F_DELETED flag set)
*/
ctx->cur = ctx->cur->next;
}
/* next server is null, end of iteration */
if (ctx->cur == NULL) {
lua_pushnil(L);
return 1;
}
lua_pushstring(L, ctx->cur->id);
hlua_fcn_new_server(L, ctx->cur);
return 2;
}
/* init the iterator context, return iterator function
* with context as closure. The only argument is a
* server list object.
*/
int hlua_listable_servers_pairs(lua_State *L)
{
struct hlua_server_list_iterator_context *ctx;
struct hlua_server_list *hlua_srv_list;
hlua_srv_list = hlua_check_server_list(L, 1);
ctx = lua_newuserdata(L, sizeof(*ctx));
ctx->px = hlua_srv_list->px;
ctx->cur = NULL;
lua_pushcclosure(L, hlua_listable_servers_pairs_iterator, 1);
return 1;
}
void hlua_listable_servers(lua_State *L, struct proxy *px)
{
struct hlua_server_list *list;
lua_newtable(L);
list = lua_newuserdata(L, sizeof(*list));
list->px = px;
lua_rawseti(L, -2, 0);
lua_rawgeti(L, LUA_REGISTRYINDEX, class_server_list_ref);
lua_setmetatable(L, -2);
}
static struct proxy *hlua_check_proxy(lua_State *L, int ud)
{
return hlua_checkudata(L, ud, class_proxy_ref);
}
int hlua_proxy_get_name(lua_State *L)
{
struct proxy *px;
px = hlua_check_proxy(L, 1);
lua_pushstring(L, px->id);
return 1;
}
int hlua_proxy_get_uuid(lua_State *L)
{
struct proxy *px;
char buffer[17];
px = hlua_check_proxy(L, 1);
snprintf(buffer, sizeof(buffer), "%d", px->uuid);
lua_pushstring(L, buffer);
return 1;
}
/* __index metamethod for proxy class
* support for additional keys that are missing from the main table
* stack:1 = table (proxy class), stack:2 = requested key
* Returns 1 if key is supported
* else returns 0 to make lua return NIL value to the caller
*/
static int hlua_proxy_index(struct lua_State *L)
{
const char *key = lua_tostring(L, 2);
if (!strcmp(key, "name")) {
if (ONLY_ONCE())
ha_warning("hlua: use of proxy 'name' attribute is deprecated and will eventually be removed, please use get_name() function instead: %s\n", hlua_traceback(L, ", "));
lua_pushvalue(L, 1);
hlua_proxy_get_name(L);
return 1;
}
if (!strcmp(key, "uuid")) {
if (ONLY_ONCE())
ha_warning("hlua: use of proxy 'uuid' attribute is deprecated and will eventually be removed, please use get_uuid() function instead: %s\n", hlua_traceback(L, ", "));
lua_pushvalue(L, 1);
hlua_proxy_get_uuid(L);
return 1;
}
/* unknown attribute */
return 0;
}
int hlua_proxy_pause(lua_State *L)
{
struct proxy *px;
px = hlua_check_proxy(L, 1);
/* safe to call without PROXY_LOCK - pause_proxy takes it */
pause_proxy(px);
return 0;
}
int hlua_proxy_resume(lua_State *L)
{
struct proxy *px;
px = hlua_check_proxy(L, 1);
/* safe to call without PROXY_LOCK - resume_proxy takes it */
resume_proxy(px);
return 0;
}
int hlua_proxy_stop(lua_State *L)
{
struct proxy *px;
px = hlua_check_proxy(L, 1);
/* safe to call without PROXY_LOCK - stop_proxy takes it */
stop_proxy(px);
return 0;
}
int hlua_proxy_get_cap(lua_State *L)
{
struct proxy *px;
const char *str;
px = hlua_check_proxy(L, 1);
str = proxy_cap_str(px->cap);
lua_pushstring(L, str);
return 1;
}
int hlua_proxy_get_stats(lua_State *L)
{
struct proxy *px;
int i;
px = hlua_check_proxy(L, 1);
if (px->cap & PR_CAP_BE)
stats_fill_be_stats(px, STAT_SHLGNDS, stats, STATS_LEN, NULL);
else
stats_fill_fe_stats(px, stats, STATS_LEN, NULL);
lua_newtable(L);
for (i=0; i<ST_F_TOTAL_FIELDS; i++) {
lua_pushstring(L, stat_fields[i].name);
hlua_fcn_pushfield(L, &stats[i]);
lua_settable(L, -3);
}
return 1;
}
int hlua_proxy_get_mode(lua_State *L)
{
struct proxy *px;
const char *str;
px = hlua_check_proxy(L, 1);
str = proxy_mode_str(px->mode);
lua_pushstring(L, str);
return 1;
}
int hlua_proxy_shut_bcksess(lua_State *L)
{
struct proxy *px;
px = hlua_check_proxy(L, 1);
srv_shutdown_backup_streams(px, SF_ERR_KILLED);
return 0;
}
int hlua_proxy_get_srv_act(lua_State *L)
{
struct proxy *px;
px = hlua_check_proxy(L, 1);
lua_pushinteger(L, px->srv_act);
return 1;
}
int hlua_proxy_get_srv_bck(lua_State *L)
{
struct proxy *px;
px = hlua_check_proxy(L, 1);
lua_pushinteger(L, px->srv_bck);
return 1;
}
/* Get mailers config info, used to implement email alert sending
* according to mailers config from lua.
*/
int hlua_proxy_get_mailers(lua_State *L)
{
struct proxy *px;
int it;
struct mailer *mailer;
px = hlua_check_proxy(L, 1);
if (!px->email_alert.mailers.m)
return 0; /* email-alert mailers not found on proxy */
lua_newtable(L);
/* option log-health-checks */
lua_pushstring(L, "track_server_health");
lua_pushboolean(L, (px->options2 & PR_O2_LOGHCHKS));
lua_settable(L, -3);
/* email-alert level */
lua_pushstring(L, "log_level");
lua_pushinteger(L, px->email_alert.level);
lua_settable(L, -3);
/* email-alert mailers */
lua_pushstring(L, "mailservers");
lua_newtable(L);
for (it = 0, mailer = px->email_alert.mailers.m->mailer_list;
it < px->email_alert.mailers.m->count; it++, mailer = mailer->next) {
char *srv_address;
lua_pushstring(L, mailer->id);
/* For now, we depend on mailer->addr to restore mailer's address which
* was converted using str2sa_range() on startup.
*
* FIXME?:
* It could be a good idea to pass the raw address (unparsed) to allow fqdn
* to be resolved at runtime, unless we consider this as a pure legacy mode
* and mailers config support is going to be removed in the future?
*/
srv_address = sa2str(&mailer->addr, get_host_port(&mailer->addr), 0);
if (srv_address) {
lua_pushstring(L, srv_address);
ha_free(&srv_address);
lua_settable(L, -3);
}
}
lua_settable(L, -3);
/* mailers timeout (from mailers section) */
lua_pushstring(L, "mailservers_timeout");
lua_pushinteger(L, px->email_alert.mailers.m->timeout.mail);
lua_settable(L, -3);
/* email-alert myhostname */
lua_pushstring(L, "smtp_hostname");
lua_pushstring(L, px->email_alert.myhostname);
lua_settable(L, -3);
/* email-alert from */
lua_pushstring(L, "smtp_from");
lua_pushstring(L, px->email_alert.from);
lua_settable(L, -3);
/* email-alert to */
lua_pushstring(L, "smtp_to");
lua_pushstring(L, px->email_alert.to);
lua_settable(L, -3);
return 1;
}
int hlua_fcn_new_proxy(lua_State *L, struct proxy *px)
{
struct listener *lst;
int lid;
char buffer[17];
lua_newtable(L);
/* Pop a class proxy metatable and affect it to the userdata. */
lua_rawgeti(L, LUA_REGISTRYINDEX, class_proxy_ref);
lua_setmetatable(L, -2);
lua_pushlightuserdata(L, px);
lua_rawseti(L, -2, 0);
/* set public methods */
hlua_class_function(L, "get_name", hlua_proxy_get_name);
hlua_class_function(L, "get_uuid", hlua_proxy_get_uuid);
hlua_class_function(L, "pause", hlua_proxy_pause);
hlua_class_function(L, "resume", hlua_proxy_resume);
hlua_class_function(L, "stop", hlua_proxy_stop);
hlua_class_function(L, "shut_bcksess", hlua_proxy_shut_bcksess);
hlua_class_function(L, "get_cap", hlua_proxy_get_cap);
hlua_class_function(L, "get_mode", hlua_proxy_get_mode);
hlua_class_function(L, "get_srv_act", hlua_proxy_get_srv_act);
hlua_class_function(L, "get_srv_bck", hlua_proxy_get_srv_bck);
hlua_class_function(L, "get_stats", hlua_proxy_get_stats);
hlua_class_function(L, "get_mailers", hlua_proxy_get_mailers);
/* Browse and register servers. */
lua_pushstring(L, "servers");
hlua_listable_servers(L, px);
lua_settable(L, -3);
/* Browse and register listeners. */
lua_pushstring(L, "listeners");
lua_newtable(L);
lid = 1;
list_for_each_entry(lst, &px->conf.listeners, by_fe) {
if (lst->name)
lua_pushstring(L, lst->name);
else {
snprintf(buffer, sizeof(buffer), "sock-%d", lid);
lid++;
lua_pushstring(L, buffer);
}
hlua_fcn_new_listener(L, lst);
lua_settable(L, -3);
}
lua_settable(L, -3);
if (px->table && px->table->id) {
lua_pushstring(L, "stktable");
hlua_fcn_new_stktable(L, px->table);
lua_settable(L, -3);
}
return 1;
}
static struct hlua_proxy_list *hlua_check_proxy_list(lua_State *L, int ud)
{
return hlua_checkudata(L, ud, class_proxy_list_ref);
}
/* does nothing and returns 0, only prevents insertions in the
* table which represent list of proxies
*/
int hlua_listable_proxies_newindex(lua_State *L) {
return 0;
}
/* first arg is the table (struct hlua_proxy_list * in metadata)
* second arg is the required index
*/
int hlua_listable_proxies_index(lua_State *L)
{
struct hlua_proxy_list *hlua_px;
const char *name;
struct proxy *px;
hlua_px = hlua_check_proxy_list(L, 1);
name = luaL_checkstring(L, 2);
px = NULL;
if (hlua_px->capabilities & PR_CAP_FE) {
px = proxy_find_by_name(name, PR_CAP_FE, 0);
}
if (!px && hlua_px->capabilities & PR_CAP_BE) {
px = proxy_find_by_name(name, PR_CAP_BE, 0);
}
if (px == NULL) {
lua_pushnil(L);
return 1;
}
hlua_fcn_new_proxy(L, px);
return 1;
}
static inline int hlua_listable_proxies_match(struct proxy *px, char cap) {
return ((px->cap & cap) && !(px->cap & (PR_CAP_DEF | PR_CAP_INT)));
}
/* iterator must return key as string and value as proxy
* object, if we reach end of list, it returns nil
*/
int hlua_listable_proxies_pairs_iterator(lua_State *L)
{
int context_index;
struct hlua_proxy_list_iterator_context *ctx;
context_index = lua_upvalueindex(1);
ctx = lua_touserdata(L, context_index);
if (ctx->next == NULL) {
lua_pushnil(L);
return 1;
}
lua_pushstring(L, ctx->next->id);
hlua_fcn_new_proxy(L, ctx->next);
for (ctx->next = ctx->next->next;
ctx->next && !hlua_listable_proxies_match(ctx->next, ctx->capabilities);
ctx->next = ctx->next->next);
return 2;
}
/* init the iterator context, return iterator function
* with context as closure. The only argument is a
* proxy object.
*/
int hlua_listable_proxies_pairs(lua_State *L)
{
struct hlua_proxy_list_iterator_context *ctx;
struct hlua_proxy_list *hlua_px;
hlua_px = hlua_check_proxy_list(L, 1);
ctx = lua_newuserdata(L, sizeof(*ctx));
ctx->capabilities = hlua_px->capabilities;
for (ctx->next = proxies_list;
ctx->next && !hlua_listable_proxies_match(ctx->next, ctx->capabilities);
ctx->next = ctx->next->next);
lua_pushcclosure(L, hlua_listable_proxies_pairs_iterator, 1);
return 1;
}
void hlua_listable_proxies(lua_State *L, char capabilities)
{
struct hlua_proxy_list *list;
lua_newtable(L);
list = lua_newuserdata(L, sizeof(*list));
list->capabilities = capabilities;
lua_rawseti(L, -2, 0);
lua_rawgeti(L, LUA_REGISTRYINDEX, class_proxy_list_ref);
lua_setmetatable(L, -2);
}
int hlua_event_sub_unsub(lua_State *L)
{
struct event_hdl_sub *sub = hlua_checkudata(L, 1, class_event_sub_ref);
BUG_ON(!sub);
event_hdl_take(sub); /* keep a reference on sub until the item is GCed */
event_hdl_unsubscribe(sub); /* will automatically call event_hdl_drop() */
return 0;
}
int hlua_event_sub_gc(lua_State *L)
{
struct event_hdl_sub *sub = hlua_checkudata(L, 1, class_event_sub_ref);
BUG_ON(!sub);
event_hdl_drop(sub); /* final drop of the reference */
return 0;
}
int hlua_fcn_new_event_sub(lua_State *L, struct event_hdl_sub *sub)
{
lua_newtable(L);
/* Pop a class event_sub metatable and affect it to the userdata. */
lua_rawgeti(L, LUA_REGISTRYINDEX, class_event_sub_ref);
lua_setmetatable(L, -2);
lua_pushlightuserdata(L, sub);
lua_rawseti(L, -2, 0);
/* userdata is affected: increment sub refcount */
event_hdl_take(sub);
/* set public methods */
hlua_class_function(L, "unsub", hlua_event_sub_unsub);
return 1;
}
/* This Lua function take a string, a list of separators.
* It tokenize the input string using the list of separators
* as separator.
*
* The functionreturns a table filled with tokens.
*/
int hlua_tokenize(lua_State *L)
{
const char *str;
const char *sep;
int index;
const char *token;
const char *p;
const char *c;
int ignore_empty;
ignore_empty = 0;
str = luaL_checkstring(L, 1);
sep = luaL_checkstring(L, 2);
if (lua_gettop(L) == 3)
ignore_empty = hlua_checkboolean(L, 3);
lua_newtable(L);
index = 1;
token = str;
p = str;
while(1) {
for (c = sep; *c != '\0'; c++)
if (*p == *c)
break;
if (*p == *c) {
if ((!ignore_empty) || (p - token > 0)) {
lua_pushlstring(L, token, p - token);
lua_rawseti(L, -2, index);
index++;
}
token = p + 1;
}
if (*p == '\0')
break;
p++;
}
return 1;
}
int hlua_parse_addr(lua_State *L)
{
struct net_addr *addr;
const char *str = luaL_checkstring(L, 1);
unsigned char mask;
addr = lua_newuserdata(L, sizeof(struct net_addr));
if (!addr) {
lua_pushnil(L);
return 1;
}
if (str2net(str, PAT_MF_NO_DNS, &addr->addr.v4.ip, &addr->addr.v4.mask)) {
addr->family = AF_INET;
return 1;
}
if (str62net(str, &addr->addr.v6.ip, &mask)) {
len2mask6(mask, &addr->addr.v6.mask);
addr->family = AF_INET6;
return 1;
}
lua_pop(L, 1);
lua_pushnil(L);
return 1;
}
int hlua_match_addr(lua_State *L)
{
struct net_addr *addr1;
struct net_addr *addr2;
if (!lua_isuserdata(L, 1) ||
!lua_isuserdata(L, 2)) {
lua_pushboolean(L, 0);
return 1;
}
addr1 = lua_touserdata(L, 1);
addr2 = lua_touserdata(L, 2);
if (addr1->family != addr2->family) {
lua_pushboolean(L, 0);
return 1;
}
if (addr1->family == AF_INET) {
if ((addr1->addr.v4.ip.s_addr & addr2->addr.v4.mask.s_addr) ==
(addr2->addr.v4.ip.s_addr & addr1->addr.v4.mask.s_addr)) {
lua_pushboolean(L, 1);
return 1;
}
} else {
int i;
for (i = 0; i < 16; i += 4) {
if ((read_u32(&addr1->addr.v6.ip.s6_addr[i]) &
read_u32(&addr2->addr.v6.mask.s6_addr[i])) !=
(read_u32(&addr2->addr.v6.ip.s6_addr[i]) &
read_u32(&addr1->addr.v6.mask.s6_addr[i])))
break;
}
if (i == 16) {
lua_pushboolean(L, 1);
return 1;
}
}
lua_pushboolean(L, 0);
return 1;
}
static struct my_regex **hlua_check_regex(lua_State *L, int ud)
{
return (hlua_checkudata(L, ud, class_regex_ref));
}
static int hlua_regex_comp(struct lua_State *L)
{
struct my_regex **regex;
const char *str;
int cs;
char *err;
str = luaL_checkstring(L, 1);
luaL_argcheck(L, lua_isboolean(L, 2), 2, NULL);
cs = lua_toboolean(L, 2);
regex = lua_newuserdata(L, sizeof(*regex));
err = NULL;
if (!(*regex = regex_comp(str, cs, 1, &err))) {
lua_pushboolean(L, 0); /* status error */
lua_pushstring(L, err); /* Reason */
free(err);
return 2;
}
lua_pushboolean(L, 1); /* Status ok */
/* Create object */
lua_newtable(L);
lua_pushvalue(L, -3); /* Get the userdata pointer. */
lua_rawseti(L, -2, 0);
lua_rawgeti(L, LUA_REGISTRYINDEX, class_regex_ref);
lua_setmetatable(L, -2);
return 2;
}
static int hlua_regex_exec(struct lua_State *L)
{
struct my_regex **regex;
const char *str;
size_t len;
struct buffer *tmp;
regex = hlua_check_regex(L, 1);
str = luaL_checklstring(L, 2, &len);
if (!*regex) {
lua_pushboolean(L, 0);
return 1;
}
/* Copy the string because regex_exec2 require a 'char *'
* and not a 'const char *'.
*/
tmp = get_trash_chunk();
if (len >= tmp->size) {
lua_pushboolean(L, 0);
return 1;
}
memcpy(tmp->area, str, len);
lua_pushboolean(L, regex_exec2(*regex, tmp->area, len));
return 1;
}
static int hlua_regex_match(struct lua_State *L)
{
struct my_regex **regex;
const char *str;
size_t len;
regmatch_t pmatch[20];
int ret;
int i;
struct buffer *tmp;
regex = hlua_check_regex(L, 1);
str = luaL_checklstring(L, 2, &len);
if (!*regex) {
lua_pushboolean(L, 0);
return 1;
}
/* Copy the string because regex_exec2 require a 'char *'
* and not a 'const char *'.
*/
tmp = get_trash_chunk();
if (len >= tmp->size) {
lua_pushboolean(L, 0);
return 1;
}
memcpy(tmp->area, str, len);
ret = regex_exec_match2(*regex, tmp->area, len, 20, pmatch, 0);
lua_pushboolean(L, ret);
lua_newtable(L);
if (ret) {
for (i = 0; i < 20 && pmatch[i].rm_so != -1; i++) {
lua_pushlstring(L, str + pmatch[i].rm_so, pmatch[i].rm_eo - pmatch[i].rm_so);
lua_rawseti(L, -2, i + 1);
}
}
return 2;
}
static int hlua_regex_free(struct lua_State *L)
{
struct my_regex **regex;
regex = hlua_check_regex(L, 1);
regex_free(*regex);
*regex = NULL;
return 0;
}
void hlua_fcn_reg_core_fcn(lua_State *L)
{
hlua_concat_init(L);
hlua_queue_init(L);
hlua_class_function(L, "now", hlua_now);
hlua_class_function(L, "http_date", hlua_http_date);
hlua_class_function(L, "imf_date", hlua_imf_date);
hlua_class_function(L, "rfc850_date", hlua_rfc850_date);
hlua_class_function(L, "asctime_date", hlua_asctime_date);
hlua_class_function(L, "concat", hlua_concat_new);
hlua_class_function(L, "queue", hlua_queue_new);
hlua_class_function(L, "get_info", hlua_get_info);
hlua_class_function(L, "parse_addr", hlua_parse_addr);
hlua_class_function(L, "match_addr", hlua_match_addr);
hlua_class_function(L, "tokenize", hlua_tokenize);
/* Create regex object. */
lua_newtable(L);
hlua_class_function(L, "new", hlua_regex_comp);
lua_newtable(L); /* The metatable. */
lua_pushstring(L, "__index");
lua_newtable(L);
hlua_class_function(L, "exec", hlua_regex_exec);
hlua_class_function(L, "match", hlua_regex_match);
lua_rawset(L, -3); /* -> META["__index"] = TABLE */
hlua_class_function(L, "__gc", hlua_regex_free);
lua_pushvalue(L, -1); /* Duplicate the metatable reference. */
class_regex_ref = hlua_register_metatable(L, CLASS_REGEX);
lua_setmetatable(L, -2);
lua_setglobal(L, CLASS_REGEX); /* Create global object called Regex */
/* Create stktable object. */
lua_newtable(L);
lua_pushstring(L, "__index");
lua_newtable(L);
hlua_class_function(L, "info", hlua_stktable_info);
hlua_class_function(L, "lookup", hlua_stktable_lookup);
hlua_class_function(L, "dump", hlua_stktable_dump);
lua_settable(L, -3); /* -> META["__index"] = TABLE */
class_stktable_ref = hlua_register_metatable(L, CLASS_STKTABLE);
/* Create listener object. */
lua_newtable(L);
lua_pushstring(L, "__index");
lua_newtable(L);
hlua_class_function(L, "get_stats", hlua_listener_get_stats);
lua_settable(L, -3); /* -> META["__index"] = TABLE */
class_listener_ref = hlua_register_metatable(L, CLASS_LISTENER);
/* Create event_sub object. */
lua_newtable(L);
hlua_class_function(L, "__gc", hlua_event_sub_gc);
class_event_sub_ref = hlua_register_metatable(L, CLASS_EVENT_SUB);
/* Create server object. */
lua_newtable(L);
hlua_class_function(L, "__gc", hlua_server_gc);
hlua_class_function(L, "__index", hlua_server_index);
class_server_ref = hlua_register_metatable(L, CLASS_SERVER);
/* Create proxy object. */
lua_newtable(L);
hlua_class_function(L, "__index", hlua_proxy_index);
class_proxy_ref = hlua_register_metatable(L, CLASS_PROXY);
/* list of proxy objects. Instead of having a static array
* of proxies, we use special metamethods that rely on internal
* proxies list so that the array is resolved at runtime.
*
* To emulate the same behavior than Lua array, we implement some
* metatable functions:
* - __newindex : prevent the insertion of a new item in the array
* - __index : find a proxy in the list using "name" index
* - __pairs : iterate through available proxies in the list
*/
lua_newtable(L);
hlua_class_function(L, "__index", hlua_listable_proxies_index);
hlua_class_function(L, "__newindex", hlua_listable_proxies_newindex);
hlua_class_function(L, "__pairs", hlua_listable_proxies_pairs);
class_proxy_list_ref = hlua_register_metatable(L, CLASS_PROXY_LIST);
/* Create proxies entry. */
lua_pushstring(L, "proxies");
hlua_listable_proxies(L, PR_CAP_LISTEN);
lua_settable(L, -3);
/* Create frontends entry. */
lua_pushstring(L, "frontends");
hlua_listable_proxies(L, PR_CAP_FE);
lua_settable(L, -3);
/* Create backends entry. */
lua_pushstring(L, "backends");
hlua_listable_proxies(L, PR_CAP_BE);
lua_settable(L, -3);
/* list of server. This object is similar to
* CLASS_PROXY_LIST
*/
lua_newtable(L);
hlua_class_function(L, "__index", hlua_listable_servers_index);
hlua_class_function(L, "__newindex", hlua_listable_servers_newindex);
hlua_class_function(L, "__pairs", hlua_listable_servers_pairs);
class_server_list_ref = hlua_register_metatable(L, CLASS_SERVER_LIST);
}
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